integral() failing with "segmentation fault"

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Hi sage community

My question again arises from exercises in technical chemistry done in sage. I wanted to calculate an definite integral (number of transfer units).

var('x')
ys=0.06+2*(x-0.0275)
xs=ys/1.516

#my function
i=1/(xs/(1+xs)-x/(1+x))
#print i
#show(plot(i,x,0,0.03))

#I, the indefinite integral of i
I=integral(i,x)
#print I
#show(plot(I,x,0,0.03))

#three methods too calculate the integral
print n(I(x=0.0275)-I(x=0))
print numerical_integral(i,0,0.0275)
print integral(i,x,0,0.275)

The first two methods work fine. The last method gives me the infinite of the following messages.

;;;
;;; Detected access to protected memory, also kwown as 'bus or segmentation fault'.
;;; Jumping to the outermost toplevel prompt
;;;

This is a bug, isn't it? However, i have no idea how integrate() works.

Greetings, marv